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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>All,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Given the following rule:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>rule</span></font></b><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> </span></font><font size=2 color=green face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:green'>"Add ABC123
Feature"</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> </span></font><b><font size=2
color="#960000" face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:#960000;font-weight:bold'>when</span></font></b><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> </span></font><b><font
size=2 color="#960000" face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:#960000;font-weight:bold'>not</span></font></b><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:black'> MyFeature(testCD == </span></font><font size=2
color=green face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:green'>"ABC123"</span></font><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'>)</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> UserRequest(someValue
== </span></font><font size=2 color=green face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:green'>"ABC123_FEATURE"</span></font><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:black'>)</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> $eligible
: FeatureEligible(testCD == </span></font><font size=2 color=green
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:green'>"ABC123"</span></font><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'>)</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> </span></font><b><font size=2
color="#960000" face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:#960000;font-weight:bold'>then</span></font></b><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> </span></font><b><font
size=2 color="#960000" face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:#960000;font-weight:bold'>insert</span></font></b><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:black'>(</span></font><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>new</span></font></b><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> MyFeature($eligible)); </span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>end</span></font></b><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’d like to create a DSL. Notice that “testCD”
is the same value. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Is it possible to apply a value captured in a DSL and use it
in more than one condition? In the above scenario we want to
see if the user is eligible for the feature ABC123, and check whether or not
that feature has already been added in working memory. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>The DSL version of the rule might
look something like:<br>
</span></font><b><font size=2 color="#960000" face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:#960000;font-weight:
bold'>rule</span></font></b><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:black'> </span></font><font
size=2 color=green face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:green'>"Add ABC123 Feature"</span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> </span></font><b><font size=2
color="#960000" face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:#960000;font-weight:bold'>when</span></font></b><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> User </span></font><b><font
size=2 color="#960000" face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:#960000;font-weight:bold'>is</span></font></b><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:black'> eligible </span></font><b><font size=2
color="#960000" face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:#960000;font-weight:bold'>for</span></font></b><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:black'> </span></font><font size=2 color=green
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:green'>"ABC123"</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> User requests </span></font><font
size=2 color=green face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:green'>"ABC123_FEATURE"</span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> </span></font><b><font size=2
color="#960000" face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:#960000;font-weight:bold'>then</span></font></b><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> Add
feature </span></font><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>end</span></font></b><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Would I need to write the DSL for the “ABC123”
piece like this?<o:p></o:p></span></font></p>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'>[when]User is eligible for “{testCD}”=not MyFeature(testCD == “{testCD}”) $eligible : FeatureEligible(testCD = “{testCD}”)<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Or will I always need to create 2 statements? <o:p></o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>What are the performance implications of using a DSL? Is there extra overhead at runtime or does all the interpretation occur at rule compilation?<o:p></o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks!<o:p></o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Macon<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
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